C# How to Properly Consume Yelp GraphQL api

Question

I'm trying to call the business endpoint of Yelp's GraphQL api with my asp.net core mvc application using GraphQLHttpClient. I have the api and bearer token configured in my client instance. I followed the query structure here using business as the endpoint and I just wanted Id and Name fields from the data. When I call SendQueryAsync(query), I get a GraphQL Error from the response. I'm not sure if I'm making an improper httprequest and/or my query is written wrong. I couldn't find any YouTube videos, stackoverflow questions, or github projects regarding consuming Yelp's GraphQL api using C#. Any help is appreciated. Thank you! Below is my source code and attached response.

[Update: Resolved Issued]

There were a collection of issues. Added additional required fields with variables to YelpGraphQL query for GraphQL request. More about query structure and variable declaration is explained in this thread. Overrided the casing of the fields (ty Neil). Fixed the responsetype class and added the missing classes (ty Neil). Added searchconsumer class to controller via dependency injection. Also I will post copied text of exceptions next time.

Classes

public class Business
{
    [JsonPropertyName("id")]
    public string Id { get; set; }
    [JsonPropertyName("name")]
    public string Name { get; set; }
}

public class Search
{
    [JsonPropertyName("business")]
    public List<Business> business { get; set; }
}

public class SearchResponseType
{
    [JsonPropertyName("search")]
    public Search Search { get; set; }
}

public interface ISearchConsumer
{
    public Task<List<Business>> GetAllBusinesses();
}

public class SearchConsumer : ISearchConsumer
{
    private readonly ApplicationDbContext _dbContext;

    public SearchConsumer(ApplicationDbContext dbContext)
    {
        _dbContext = dbContext;
    }

    public async Task<List<Business>> GetAllBusinesses()
    {
        var authorization = _dbContext.Authorizations.FirstOrDefault().Token;
        var _client = new GraphQLHttpClient("https://api.yelp.com/v3/graphql", new NewtonsoftJsonSerializer());
        _client.HttpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", authorization);
        var query = new GraphQLRequest
        {
            Query = @"
            query($termId: String $locationId: String){
                search(term:$termId location:$locationId) {
                    business {
                        id
                        name
                    }
                }
            }",
            Variables = new
            {
                termId = "burrito",
                locationId = "san francisco"
            }
        };
        var response = await _client.SendQueryAsync<SearchResponseType>(query);
        var businesses = response.Data.Search.business;
        return businesses;
    }
}

Controllers

public class YelpGraphQLController : Controller
{
    private readonly ISearchConsumer _consumer;

    public YelpGraphQLController(ISearchConsumer consumer)
    {
        _consumer = consumer;
    }

    public IActionResult Index()
    {
        return View();
    }

    [HttpGet]
    public async Task<IActionResult> Get()
    {
        var businesses = await _consumer.GetAllBusinesses();
        return Ok(businesses);
    }
}

Program

ConfigureServices(builder.Services);

void ConfigureServices(IServiceCollection services)
{
    services.AddTransient<ISearchConsumer, SearchConsumer>();
}

YelpGraphQL Json Data Example

{
  "data": {
    "search": {
      "business": [
        {
          "id": "wGl_DyNxSv8KUtYgiuLhmA",
          "name": "Bi-Rite Creamery"
        },
        {
          "id": "lJAGnYzku5zSaLnQ_T6_GQ",
          "name": "Brenda's French Soul Food"
        }
      ]
    }
  }
}

Debug GraphQL Error

Answer 1

I'm guessing that the deserialization isn't working because of the casing of the fields vs your class, which you can override like so:

public class Business
{
    [JsonPropertyName("id")]
    public string Id { get; set; }
    [JsonPropertyName("name")]
    public string Name { get; set; }
}

public class ResponseBusinessCollectionType
{
    [JsonPropertyName("businesses")]
    public List<Business> Businesses { get; set; }
}